Device for producing the picker stroke on a loom



Aug. 28, 1956 E. MULLER DEVICE FOR PRODUCING THE PICKER' STROKE ON A LOOM 3 Sheets-Sheet 1 Filed Dec. 51, 1952 E. MULLER Aug. 28, 1956 DEVICE FOR PRODUCING THE PICKER STROKE ON A LOOM' Filed Dec. 51, 1952 3 Sheets-Sheet 2 Aug. 28, 1956 E. MULLER 2,760,524

DEVICE FOR PRODUCING THE PICKER STROKE ON A LOOM Filed Dec. 51, 1952 5 Sheets-Sheet s F/glia a 3i: L'J 30a 49 V K g 37 32 3o 33 f-vivr 4 040 M044 DEVICE FOR PRODUCING THE PICKER STROKE ON A LOOM Edwin Miiller, Ruti-Zurich, Switzerland Application December 31, 1952, Serial No. 328,864 Claims priority, application Switzerland July 22, 1952 6 Claims. (Cl. 139-147) The present invention relates to a device for producing the picker stroke on a loom.

The stroke of the picker is customarily produced by a picking cam, also called picking tappet or eccentric, which actuates the flexible picker drawing member through a bell crank lever. The blow of the picker must take place in a fraction of one revolution of the cam, and the velocity which can be imparted to the movement of the picker is therefore limited. In cases in which the design of the machine is such as to permit of enlargement of the cam, the intensity of the pick can be increased by so doing, but in the majority of looms this expedient is not feasible.

The object of the present invention is to accelerate the pick without any change being thereby necessitated in the speed of the drive shaft or in the diameter of the picking cam or tappet. The invention resides in rotatably connecting the cam producing the pick to the drive shaft, the latter being rotated by its shaft through a driver member; means being provided which imparts an additional angular velocity to the picking tappet at the moment of the pick.

In the accompanying drawings a typical embodiment of the invention is depicted. In the drawings:

Figure 1 is a lateral elevational view of a bush or sleeve rigidly mounted on the drive shaft of the picking tappet, and

Figure 2 is a front elevational view thereof;

Figure 3 is a lateral elevational view of a picking tappet to be mounted on the said sleeve or bush, and

Figure 4 is a front elevational view of the same;

Figure 5 is a lateral elevational view of a fixed, grooved cam, and

Figure 6 is a front elevational view thereof;

Figure 7 is a lateral elevational view of a bearing cam, and

Figure 8 is a front elevational view thereof;

Figure 9 is a front elevational view of a two-armed lever, and

Figure 10 is a lateral elevational view thereof;

Figure 11 is a lateral elevational view of an assembly, of the parts to Figures 1 to 9, and

Figure 11a is a longitudinal section along line I-I of Fig. 12 with a lever according to Fig. 10;

Figure 12 is a front elevational view thereof;

Figure 13 is a lateral elevational view of a variant embodiment, of which Figure 13a is a longitudinal sectional view of Figure 13 with lever 38 shown in elevation;

Figure 14 is a plan view in the direction of the arrow in Figure 13, and

Figure 15 is a sectional view along the line I-I in Figure 13.

The shaft 1, which is mounted in the frame 2 of the loom, supports a cam or tappet 3 which in looms of the known type is rigidly keyed to shaft 1 and actuates the picker traction member 5 through a lever 4 (Figure 13). According to the invention, however, this picking nited States Patent 2,760,524 Patented Aug. 28, 1956 tappet is not rigidly connected to the shaft 1 but is mounted on the boss 6 of a sleeve or bush 7 keyed to the shaft 1. The bush 7 has a flange 8 provided with a recess 9 whose face 10- serves to drive the cam 3. The flange 8 is further provided with a bore 12 in which the journal or fulcrum pin 13 of the two-armed lever 14 is mounted. Mounted on the collar 15 of the bush 7 and rigidly secured to it by a set screw 16 is a bearing arm 17 in whose center hole 18' the journal 13a of the lever 14 engages. The lever 14 is thus pivotally mounted in the bores 12 and 18 and rotates with the shaft 1. Also mounted rotatably on the boss 15 is a grooved eccentric 20 whose flange 20a is secured to the loom frame 2 by a screw 22. The collar 13b of the lever 14 engages in the slot- 3a of the picking cam 3 and the stud of the lever 14 engages the oval groove 3b of the picking cam 3. Mounted on the lever arm 14a of the lever 14 is the stud 13d on which [the roller 23 is mounted. The roller '23 engages in the groove 24 of the grooved eccentric 20 and rolls along therein. Also provided on the picking tappet 3 is a lug 25 (Fig. 4) in which a set screw 26 is mounted. The set screw 26 abuts the face 10 of the flange 8, whereby the position of the picking tappet 3 in relation to the shaft 1 can be adjusted.

If the shaft 1 now rotates, the bush 7, the flange 8 and the bearing arm 17 rotate with it and, driven by the face 10 of the flange 8 via the screw 26, the picking tappet 3 also. The lever 14, which is journalled in the bores 12 and 18, likewise rotates, and its roller 23 rolls along inside the non-rotating groove 24 of the grooved eccentric 20. As soon as the nose 3c of the cam 3 reaches the position in which it encounters the roller 4a (Figure 12) of the lever 4, which latter produces the travel of the picker, the roller 23 runs up on the track 24a of the grooved eccentric 20 and forces the lever arm 14a outwards, 'whereby the stud 130 of the lever 14, which engages the groove 3b of the tappet 3, imparts to the cam 3 a lead, in the direction of travel indicated by the arrow in Figure 12, by the distance a, with the result that the said cam rotates with added angular velocity and accelerates the travel of the picker.

Figures 13 to 15 show a modified embodiment. The bush 30, which has bosses 32 and 33, is rigidly keyed to the shaft 1. Rotatably mounted on the boss 32 is the drum cam 34 which is so screwed by its flange 35, by means of the screw 36, to the loom frame 2 that the boss 32 can rotate. Mounted on the boss 33 is the picking tappet 3e which is axially retained by the ring 37 screwed laterally on to the boss 33. The bush 30 has an arm 30a and a driver nose 3%. The arm 30a is provided with a recess in which the lever 38 is pivotally mounted on the pivot 39'. The cam 3e is provided with a lateral sleeve 42 in which the set screw 43 is located. Through the agency of the nose 30b the cam 3e is driven by the bush 30. The arm 38a of the two-armed lever 38 is provided with a stud 44 which engages a transverse slot 45 of the cam 3e. Mounted on the lever arm 38b is a roller 46 which rolls along the track 47 of the drum cam 34. The cam 3e has a lead imparted to it by the cam track 47 through the lever 38 in the same way as shown in Figure 12. In order to restore the cam 32 to its initial position, so that the set screw 43 again abuts the drive dog 30b, a second roller 48 is provided which, mounted on a third lever arm 380 of the lever 38, follows the track 49 of the drum cam 34.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent, is:

1. A device for producing the picker stroke in a loom, comprising a drive shaft, a picking tappet producing the picker stroke rotatably connected to said drive shaft, a

driver member for said shaft, and means for imparting additional angular velocity to the picking tappet at the moment of the pick.

2. A device according to claim 1, including a bush keyed to said shaft for driving said picking tappet, said tappet being mounted on said bush for free rotation, a grooved eccentric rotatably mounted on said bush and held against rotation thereon, and a two-armed lever pivotally mounted on said bush and provided on one of its arms with a roller adapted to follow the groove of said eccentric and on the other arm with a stud engaging with an opening in said picking tappet.

3. A device according to claim 1, including a drum cam provided with two contrarily directed cam tracks.

4. A device for producing the picker stroke in a loom by which additional angular velocity is imparted to a rotatable picking tappet at the moment of this pick comprising a drive shaft, means rotatable by said drive shaft, a double-armed lever pivoted on said rotatable means, stationary cam surface means, a first one of the arms of said lever being positionable to engage and turn said tappet, the second one of the arms being positioned to engage said cam surface means, said rotatable means being positioned .to apply turning force to said picking tappet, said cam surface means and said lever ooacting to produce said additional angular velocity at the moment of pick.

5. A device according to claim 4, said cam surface means including eccentric means provided with an endless cam groove and mounted upon said rotatable means, the rotatable means being movable with respect to said endless cam groove, said second lever arm engaging said groove.

6. The device according to claim 4, including drum cam means on said shaft, said cam surface means being disposed on said drum cam means, said lever being provided with follower means operatively engaging said drum cam means.

No references cited. 

